CN209843876U - Winding type battery cell and lithium ion battery - Google Patents
Winding type battery cell and lithium ion battery Download PDFInfo
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- CN209843876U CN209843876U CN201920726286.XU CN201920726286U CN209843876U CN 209843876 U CN209843876 U CN 209843876U CN 201920726286 U CN201920726286 U CN 201920726286U CN 209843876 U CN209843876 U CN 209843876U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model relates to a coiling type electric core and lithium ion battery, coiling type electric core include first pole piece, second pole piece and diaphragm, the head end of first pole piece and second pole piece all is equipped with first empty paper tinsel district, first pole piece still includes first single face coating district and first double-face coating district, the second pole piece with the corresponding position in first single face coating district and first double-face coating district is equipped with the second double-face coating district, the tail end of first pole piece is equipped with the empty paper tinsel district of second, be equipped with third single face coating district between the empty paper tinsel district of second and the first double-face coating district, lithium ion battery includes foretell coiling type electric core, still includes shell and protection shield. Through the structure, on the premise of ensuring normal work of the battery cell, the waistcoat structure for improving the safety performance of the battery cell is formed, and the areas of the active material coating areas of the first pole piece and the second pole piece are increased, so that the energy density of the battery cell is improved, and the use performance of the battery cell is optimized.
Description
Technical Field
The utility model relates to an energy storage device and battery technical field especially relate to a coiling type electricity core and lithium ion battery.
Background
The lithium ion battery has the characteristics of high energy, long cycle life, no memory effect and the like, and is widely applied to digital equipment such as automobiles, computers, mobile phones and the like. In order to improve the needling performance of the lithium ion battery in the prior art, a section of hollow foil is added at the tail part or the head part of a battery pole piece and is separated by a diaphragm to form a vest structure, and when a needling experiment is carried out, the electric quantity and the heat inside a battery core are uniformly discharged, so that the safety performance of the battery is improved.
However, the active material cannot be filled in the space where the vest structure is located in the battery cell, so that the battery cell must lose part of energy density to ensure the safety performance of the battery, and the larger the space occupied by the vest structure is, the lower the energy density of the battery cell is, and the usability of the battery is affected.
SUMMERY OF THE UTILITY MODEL
The present invention provides a winding type battery cell and a lithium ion battery to overcome the defect that the energy density and safety performance of the existing lithium ion battery cannot be considered.
The utility model provides a technical scheme that above-mentioned technical problem adopted is:
a winding type battery cell comprises a first pole piece, a second pole piece and a diaphragm, wherein the diaphragm is positioned between the first pole piece and the second pole piece, the first pole piece, the second pole piece and the diaphragm are wound to form the winding type battery cell, the first pole piece, the diaphragm, the second pole piece and the diaphragm are sequentially and circularly arranged along the thickness direction of the winding type battery cell, the head ends of the first pole piece and the second pole piece are respectively provided with a first empty foil area, the first pole piece is connected with a first lug in the first empty foil area, the second pole piece is connected with a second lug in the first empty foil area, the first pole piece further comprises a first single-face coating area and a first double-face coating area, the first single-face coating area is positioned between the first empty foil area and the first double-face coating area, the second pole piece is provided with a second double-face coating area in the position corresponding to the first single-face coating area and the first double-face coating area, and a second empty foil area is arranged at the tail end of the first pole piece, and a third single-side coating area is arranged between the second empty foil area and the first double-side coating area.
In a preferred embodiment, the tail end of the second pole piece is provided with a second single-side coating area, and a second empty foil area is arranged at the position of the first pole piece corresponding to the second single-side coating area.
In a preferred embodiment, the second empty foil region extends continuously and covers the outermost circle of the wound electric core.
In a preferred embodiment, the sum of the lengths of the first and third single-coated areas is greater than the length of the second single-coated area.
In a preferred embodiment, the length of the second double-coated region is greater than the length of the first double-coated region.
In a preferred embodiment, the trailing end of the separator is located between the trailing ends of the first and second pole pieces, and the leading end of the separator is superimposed between the first empty foil region and the first single-coated region of the first pole piece.
In a preferred embodiment, the tail end of the second pole piece is provided with a third empty foil area, the third empty foil area is connected with the second double-coated area, and the second double-coated area extends to a position corresponding to the third single-coated area.
In a preferred embodiment, the first tab and the second tab are located inside the winding type battery cell and located on both sides or overlapping each other in a thickness direction of the winding type battery cell.
In a preferred embodiment, the first single-side coating region, the second single-side coating region and the third single-side coating region are single-side active material coating regions, and the first double-side coating region and the second double-side coating region are double-side active material coating regions.
The utility model also provides a lithium ion battery, including foretell coiling type electricity core, still include shell and protection shield, protection shield and coiling type electricity core are located inside the shell.
The utility model discloses an at least, following beneficial effect has:
set up single face coating district, two-sided coating district and empty paper tinsel district on first pole piece, second pole piece, and each coating district forms corresponding formula structure, under the prerequisite of guaranteeing that electric core normally works, has formed the vest structure that improves electric core security performance to first pole piece, the regional area of second pole piece active material coating has been increased, thereby has improved the energy density of electric core, has optimized the performance of electric core.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a first embodiment of a winding type battery cell;
fig. 2 is a schematic structural diagram of a second embodiment of a winding type battery cell;
fig. 3 is a schematic structural diagram of a third embodiment of a winding type battery cell.
Detailed Description
The conception, specific structure and technical effects of the present invention will be described clearly and completely with reference to the accompanying drawings and embodiments, so as to fully understand the objects, aspects and effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the description of the upper, lower, left, right, etc. used in the present invention is only relative to the mutual positional relationship of the components of the present invention in the drawings.
Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
Example 1
Referring to fig. 1, the winding type battery cell in this embodiment includes a first pole piece 11, a second pole piece 12, and a diaphragm 15, where the first pole piece 11 and the second pole piece 12 have different polarities, the diaphragm 15 is always located between the first pole piece 11 and the second pole piece 12, the first pole piece 11, the second pole piece 12, and the diaphragm 15 are stacked and wound to form the winding type battery cell, and the first pole piece 11, the diaphragm 15, the second pole piece 12, and the diaphragm 15 are sequentially and cyclically arranged in a thickness direction of the battery cell. The head ends of the first pole piece 11 and the second pole piece 12 are located inside the battery cell, the head end of the first pole piece 11 is connected with a first pole lug 13, the head end of the second pole piece 12 is connected with a second pole lug 14, and the head end of the diaphragm 15 is overlapped at the center inside the battery cell.
First pole piece 11 and the head end department of second pole piece 12 all are equipped with first empty paper tinsel district 16, and first utmost point ear 13 and second utmost point ear 14 all are located first empty paper tinsel district 16 for uncoated active material's first empty paper tinsel district 16, under the range prerequisite of first pole piece 11, diaphragm 15, second pole piece 12, diaphragm 15, form the vest structure, and the area in vest district is great, consequently, when electric core suffered acupuncture or other collision injuries, electric quantity and heat that the electric core short circuit formed can evenly be emitted from first empty paper tinsel district 16, prevent that electric core from catching fire, thereby improve the security performance of electric core.
The first pole piece 11 further comprises a first single-side coated area 111 and a first double-side coated area 112, the first single-side coated area 111 is located between the first empty foil area 16 and the first double-side coated area 112, and a third single-side coated area 113 is further connected to the termination of the first double-side coated area 112; the second pole piece 12 further comprises a second double coated area 121 and a second single coated area 122, the second double coated area 121 being located between the first empty foil area 16 and the second single coated area 122, the second single coated area 122 extending all the way to the trailing end of the second pole piece 12. Through the arrangement, on the basis of ensuring the safety performance of the battery cell, the coating areas of the active substances of the first pole piece 11 and the second pole piece 12 are increased, so that the battery cell has high energy density and high safety, and the use performance of the battery cell is optimized.
The sum of the lengths of the first single-sided coating area 111 and the third single-sided coating area 113 is greater than the length of the second single-sided coating area 122, the first double-sided coating area 112 corresponds to the second double-sided coating area 121, the length of the second double-sided coating area 121 is greater than the length of the first double-sided coating area 112, and the second double-sided coating area 121 continues to extend to the end of the third single-sided coating area 113, that is, the second double-sided coating area 121 corresponds to the overall length of the first double-sided coating area 112 and the third single-sided coating area 113 after being connected; the tail end of the diaphragm 15 continues to extend based on the tail end of the second pole piece 12, so that the tail end of the diaphragm 15 is located between the tail end of the first pole piece 11 and the tail end of the second pole piece 12, the internal short circuit of the battery cell is prevented, the safety performance of the battery cell is improved, the friction force between the tail end of the first pole piece 11 and the internal of the battery cell is increased, the impact force applied to the main body of the battery cell in the falling process is reduced, and the falling performance of the battery cell is improved; the head ends of the first pole piece 11 and the second pole piece 12 are located inside the battery core, the head end of the diaphragm 15 is located at the center of the inside of the battery core, the starting end of the diaphragm 15 is longer than the first pole piece 11 and the starting end of the second pole piece 12, the starting end of the diaphragm 15 is overlapped at the center of the battery core to form two layers, the number of layers of the diaphragm is small, the thickness of the battery core is reduced, the first pole lug 13 and the second pole lug 14 are located on two sides of the battery core respectively, and are symmetrical with respect to the left and right of the central line in the thickness direction of the battery core, after the winding of the battery core is completed, the flatness.
The tail end of the first pole piece 11 is further provided with a second empty foil area 17, and the second empty foil area 17 starts from the termination of the third single-sided coating area 113 and continues to extend until the outermost side of the battery cell is coated. The tail end of the second hollow foil area 17 of the first pole piece 11 exceeds the positions of the diaphragm 15 and the tail end of the second single-face coating area 122, and is wound along the outer surface of the battery cell, and finally is attached to the outermost side of the battery cell, and the tail of the second hollow foil area is fixed relatively to the outermost ring of the battery cell through glue, so that the winding of the battery cell is completed.
The second double-coated area 121 corresponds to the entirety of the first double-coated area 112 and the third single-coated area 113, the second single-coated area 122 corresponds to the second empty foil area 17, the first empty foil area 16 of the second pole piece 12 corresponds to the first single-coated area 111 of the first pole piece 11, and the first empty foil area 16 of the first pole piece 11 corresponds to the first empty foil area 16 of the second pole piece 12. Through the arrangement, the mutual matching between the single-surface coating area and the double-surface coating area in the first pole piece 11 and the second pole piece 12 is realized, and the normal work of the battery cell is ensured.
The first single-side coating area 111, the second single-side coating area 122 and the third single-side coating area 113 are all areas for coating active substances on one side of the pole piece; the first double-sided coating area 112 and the second double-sided coating area 121 are both areas coated with active substances on both sides of the pole piece; both the first and second foil areas 16, 17 are areas which are not coated with active substance. The active substance is coated on the surfaces of the first pole piece 11 and the second pole piece 12, and respectively takes part in a flow reaction at the positive pole and the negative pole of the battery cell in the charge and discharge process of the battery cell, which is the key for ensuring the energy density of the battery.
Example 2
Referring to fig. 2, this embodiment is different from embodiment 1 in that the positions of the first tab 23 and the second tab 22 and the position of the start end of the first tab 21 are changed, the positions of the second tab 22 and the separator 25 are not changed, and the areas of the first empty foil area 26, the second empty foil area 27, the first single-sided coating area 211, the first double-sided coating area 212, the third single-sided coating area 213, the second double-sided coating area 221, and the second single-sided coating area 222 are not changed.
Specifically, the first tab 23 and the second tab 24 are overlapped in the thickness direction of the battery cell, and the starting end of the first pole piece 21 is located on one side inside the battery cell, and compared with fig. 1, the number of turns of the first pole piece 21 is reduced under the condition that the coating area of the active material is not changed, so that the thickness of the battery cell is reduced, and the energy density of the battery cell is improved.
Example 3
Referring to fig. 3, this embodiment is different from embodiment 1 in that the end positions of the first pole piece 31 and the second pole piece 32 are changed.
The positions of the first single-sided coating region 311 and the first double-sided coating region 312 in the first pole piece 31 are unchanged, the third single-sided coating region 313 is reduced by half a turn based on the original position in fig. 2, and the tail end of the first pole piece 31 is reduced by a quarter of a turn based on the original position in fig. 1, so that the tail end of the first pole piece 31 is attached to the outermost surface of the battery cell; the second pole piece 32 continues to extend based on the second double-coated area 321, such that the second pole piece 32 forms a third empty foil area 37 at the tail end thereof, and the diaphragm 35 continues to extend based on the tail end extremity of the second empty foil area 37 of the second pole piece 32, such that the tail end of the diaphragm 35 is located between the tail end of the third empty foil area 37 of the first pole piece 31 and the tail end of the third empty foil area 37 of the second pole piece 32; first empty foil district 36 and third empty foil district 37 are two-sided uncoated district, and based on the arrangement form of first pole piece 31, diaphragm 35, second pole piece 32, diaphragm 35 in third empty foil district 37, the electricity core forms the vest structure in third empty foil district 37 to the electricity core all forms the vest structure in first empty foil district 36 and third empty foil district 37, and consequently the battery is receiving acupuncture or when strikeing the experiment, and two vest structures provide dual protection to the electricity core, thereby improve the security performance of electricity core greatly.
The winding direction of the battery cell in the above embodiment is counterclockwise or clockwise, and can be determined according to the actual production condition of the battery cell; the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, the first pole lug is a positive pole lug, the second pole lug is a negative pole lug, the positive pole piece is connected with the positive pole lug, and the negative pole piece is connected with the negative pole lug.
The utility model also provides a lithium ion battery, this lithium ion battery include foretell coiling formula electricity core, still include shell and protection shield, and the protection shield is connected with coiling formula electricity core to manage and protect electric core, inside protection shield and coiling formula electricity core were located the shell, prevent that the battery from colliding with and causing the damage, improved the security performance of lithium ion's battery.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A winding type battery cell is characterized by comprising a first pole piece, a second pole piece and a diaphragm, wherein the diaphragm is positioned between the first pole piece and the second pole piece, the first pole piece, the second pole piece and the diaphragm are wound to form the winding type battery cell, the first pole piece, the diaphragm, the second pole piece and the diaphragm are sequentially and circularly arranged along the thickness direction of the winding type battery cell, the head ends of the first pole piece and the second pole piece are respectively provided with a first empty foil area, the first pole piece is connected with a first lug in the first empty foil area, the second pole piece is connected with a second lug in the first empty foil area, the first pole piece further comprises a first single-face coating area and a first double-face coating area, the first single-face coating area is positioned between the first empty foil area and the first double-face coating area, the second pole piece is provided with a second double-face coating area in the position corresponding to the first single-face coating area and the first double-face coating area, and a second empty foil area is arranged at the tail end of the first pole piece, and a third single-side coating area is arranged between the second empty foil area and the first double-side coating area.
2. The wound electric core according to claim 1, wherein a second single-side coating area is provided at a tail end of the second pole piece, and the second empty foil area is provided at a position corresponding to the first single-side coating area and the second single-side coating area.
3. The wound cell of claim 2, wherein the second empty foil region extends continuously and covers an outermost circle of the wound cell.
4. The wound cell of claim 2, wherein the sum of the lengths of the first and third single-coated areas is greater than the length of the second single-coated area.
5. The wound cell of claim 1, wherein the length of the second double-coated region is greater than the length of the first double-coated region.
6. The wound cell of claim 1, wherein the tail end of the separator is located between the tail end of the first pole piece and the tail end of the second pole piece, and the head end of the separator is stacked between the first empty foil region and the first single-sided coating region of the first pole piece.
7. The wound electric core according to claim 1, wherein a third empty foil area is provided at the tail end of the second pole piece, the third empty foil area is connected to the second double-coated area, and the second double-coated area extends to a position corresponding to the third single-coated area.
8. The wound cell of claim 1, wherein the first and second tabs are located inside the wound cell and are located on both sides or coincide in a thickness direction of the wound cell.
9. The wound cell of claim 2, wherein the first, second, and third single-coated areas are single-coated active material areas, and the first and second double-coated areas are double-coated active material areas.
10. A lithium ion battery comprising the wound cell of any of claims 1 to 9, further comprising a housing and a protective plate, the protective plate and the wound cell being located inside the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920726286.XU CN209843876U (en) | 2019-05-20 | 2019-05-20 | Winding type battery cell and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920726286.XU CN209843876U (en) | 2019-05-20 | 2019-05-20 | Winding type battery cell and lithium ion battery |
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| CN209843876U true CN209843876U (en) | 2019-12-24 |
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| CN201920726286.XU Active CN209843876U (en) | 2019-05-20 | 2019-05-20 | Winding type battery cell and lithium ion battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111540881A (en) * | 2020-05-08 | 2020-08-14 | 珠海冠宇电池股份有限公司 | Negative plate, preparation method and lithium ion battery comprising negative plate |
| CN111640910A (en) * | 2020-05-18 | 2020-09-08 | 珠海冠宇电池股份有限公司 | High-specific-energy quick-charging positive plate and preparation method and application thereof |
-
2019
- 2019-05-20 CN CN201920726286.XU patent/CN209843876U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111540881A (en) * | 2020-05-08 | 2020-08-14 | 珠海冠宇电池股份有限公司 | Negative plate, preparation method and lithium ion battery comprising negative plate |
| CN111540881B (en) * | 2020-05-08 | 2021-07-06 | 珠海冠宇电池股份有限公司 | Negative plate, preparation method and lithium ion battery comprising negative plate |
| US11522168B2 (en) | 2020-05-08 | 2022-12-06 | Zhuhai Cosmx Battery Co., Ltd. | Negative electrode sheet, preparation method thereof and lithium ion battery containing the same |
| CN111640910A (en) * | 2020-05-18 | 2020-09-08 | 珠海冠宇电池股份有限公司 | High-specific-energy quick-charging positive plate and preparation method and application thereof |
| CN111640910B (en) * | 2020-05-18 | 2021-04-13 | 珠海冠宇电池股份有限公司 | High-specific-energy quick-charging positive plate and preparation method and application thereof |
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